- Thread Starter
- #41
Elkmasterwyo
WKR
With regards to the breakage of the bolt and the rear sight...
The cargo hold is not heated and the temperature changes very aggressively as the plane ascends and descends. This aggressive freeze / thaw cycle is causing brittle fracture of the metal. (The speed of the exterior temperature changes of the metal relative to the interior (core) temperature of the metal is changing so fast that the metal is expanding and contracting at the exterior surface at a much greater rate than the interior and any imperfection in the metal (or the joint of the two metals in the case of the rear sight) are being exposed as brittle fracture failure.) Normal gradual temperature changes would not manifest this brittle fracture process.
This could be the case with his sight, but I know for certain mine was from abuse. As metal was gouged, the case was dented and the bolt handle was "twisted" from the bolt.